Martinez, 27, became well known after some impressive displays in Mexico with Chiapas, and his 35 goals in 69 games there led to interest from Porto, who snapped him up in 2012. The £6.5m they spent to bring him to Portugal now looks like a bargain, as the Colombian international has now hit 58 goals in just 86 games.
But unsurprisingly, that goalscoring record hasn't gone unnoticed, and many of Europe's top clubs have been linked with big money swoops for Martinez, including Arsenal and Chelsea, who both need to sign centre forwards this summer.
Roma had been the latest club to be linked with a move for Martinez, who allegedly has a £40m release clause in his contract that Porto are holding out for, and agent William Lara admitted there is interest from Rudi Garcia's side.
"The price remains the same? It's hard to say now. It depends on supply and demand and at this time Porto are focussed on other things. Roma is a big club, no doubt. Porto at this time has not yet initiated any contact about this matter. It has other matters to think about. The situation is critical, not the best. Porto are focused on this season finale, this situation will be evaluated later," said Lara.
Yet now, reports in The Express suggest that Martinez is poised to snub a move to the Italian capital this summer in favour of a move to Manchester United - where manager David Moyes is expected to conduct a full scale overhaul of his squad at the end of the season after a disappointing campaign.
Red Devils fans will have been expecting to sign a left back, central defender and central midfielder at the very least, but Moyes could well look to sign another centre forward, as speculation continues to suggest that Robin van Persie is unhappy under the former Everton boss, as well as that Javier Hernandez may look to leave the club due to a lack of playing time this season.
With many questioning whether Moyes could attract the same calibre of players that his predecessor Sir Alex Ferguson did, landing Martinez from under the noses of Arsenal and Chelsea could be a sign that United can still be dominant in the transfer market.